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FIG. 52. An early stage of what pro to be the flat form, which, in its earliest begin-
ning, is often much like the wedge-shape extension is toward the incisal and there is an
absence of the cupping from mesial to distal. In these, the cutting is generally shallow. It
required careful adjustment of the light to get sufficient light and shade to make a good picture.
Patient, a girl nineteen years of age.
Fig. 53. The flat form in an advanced stage, but with a cuspid but little advanced, and a
triangular patch of enamel still left on one lateral and one central incisor of the upper jaw.
The incisors are cut pretty deeply at the gingival portion of the crown. The gums are in good
condition. The lower left cuspid presents a perfectly flattened labial surface from mesial to distal,
but it is a little concave from incisal to gingival. The lower left lateral is cut through its length
as though it had been cut in a planing mill, it is so level and perfect, with almost perfectly squared
edges on either side of the cut. A man about sixty years of age; a laborer, who avers that he
never owned or used a tooth brush.

Fig. 54. A flat form which ran a very rapid course, complicated with erosion of the proximal
surfaces. The small figure on the right is a labio-lingual section, intended to give more definite
information as to the loss of substance. The incisors were destroyed within five years after the
erosion was first seen. From a man of wealth about sixty years of age.
Fig. 55. A flat form complicated by erosion of the proximal surfaces, which are also flat. No
erosion of the lower teeth or any of the bicuspids or molars. The upper incisors had overlapped the
lower normally before the erosion shortened the teeth. This case presented extreme sensitiveness
of the eroded areas. A man twenty-eight years of age, a bookkeeper.